# A convex lens produces an inverted image of size 1.4 cm The size of object is 0.7 cm

11 views
ago
closed ago

A convex lens produces an inverted image of size 1.4 cm The size of object is 0.7 cm

1. What is magnification in the case

2. What is the nature of image

3. If the object is at distance 30 cm from the lens calculate focal length of the lens

+1 vote
ago by (16.0k points)
selected ago

1. m = $\frac{h_0}{h_1}$  $\frac{-1.4}{0.7}$ = -2

2. Real, inverted, magnified

3. m = $\frac{f}{f+u}$ ; -2 = $\frac{f}{f+-30}$ ,f = 20 cm